My Master's thesis was basically taking a purely theoretical paper and "replicating" it, by which I mean taking the formulae and just writing the software to run them. It sounds trivial to an outsider but even that was I guess 300 hours of work.
In general I think undergraduate projects are a great space to attempt to replicate findings, but it heavily depends on the field. Fundamental physics experiments can be expensive and require equipment that's outside the reach of undergrads. But one thing I love about engineering as an academic field, by comparison, is that anything you research tends to be more achievable for others to replicate because as your end goal you are aiming for something that's practical in the field.
In general I think undergraduate projects are a great space to attempt to replicate findings, but it heavily depends on the field. Fundamental physics experiments can be expensive and require equipment that's outside the reach of undergrads. But one thing I love about engineering as an academic field, by comparison, is that anything you research tends to be more achievable for others to replicate because as your end goal you are aiming for something that's practical in the field.